Grubel, H. G. (1971). Effective tariff protection. Geneva: General Agreement on Tariff and Trade.
Chicago Stili AlıntıGrubel, Herbert G. Effective Tariff Protection. Geneva: General Agreement on Tariff and Trade, 1971.
MLA AlıntıGrubel, Herbert G. Effective Tariff Protection. Geneva: General Agreement on Tariff and Trade, 1971.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..